Manufacturing apparatus

Abstract

To suppress an occurrence of buckling of slot paper.SOLUTION: A manufacturing apparatus includes: a rear punch 13 having a base portion 31 and a protruding portion 32 protruding from the base portion 31 toward slot paper 2; a forming punch 12 that draws the slot paper 2 into a hollow portion 21 of a die 11 while bending the slot paper 2 between the forming punch 12 and the rear punch 13; and an insertion pusher 14 that presses corner portions 2b and 2c of the bent slot paper 2 while inserting the slot paper 2 into the hollow portion 21. The insertion pusher 14 has a first pressing portion 41 for pressing a first corner portion 2b of the slot paper and a second pressing portion 42 for pressing a second corner portion 2c. The protruding portion 32 of the rear punch 13 abuts on the back surface portion 2a between the first corner portion 2b and the second corner portion 2c of the slot paper 2 and is formed to have a width of half or less in the same direction with respect to the length from the first corner portion 2b to the second corner portion 2c.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a manufacturing apparatus for a stator. [Background technology]

[0002] In recent years, motors consisting of a stator and a rotor have become widely used. In the stator, coils are housed in slots in the stator core, and insulating slot paper is inserted into these slots.

[0003] Patent Document 1 discloses a method for smoothly inserting long insulating paper into slots in a stator core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-135865 Summary of the Invention [Problem to be solved by the invention]

[0005] Slotted paper may buckle when inserted into the slot of the stator. Therefore, a common method for making slotted paper less susceptible to buckling is to fold the slotted paper in the direction of transport. However, folding the slotted paper is not a solution to the problem on the jig side used when inserting the slotted paper into the stator, but is a solution dependent on the shape of the slotted paper, leaving room for the jig side to take measures to prevent buckling of the slotted paper.

[0006] The present disclosure provides a stator manufacturing device that suppresses the occurrence of buckling of slot paper. [Means for solving the problem]

[0007] The manufacturing apparatus according to the present disclosure includes a back punch having a base and a protruding portion protruding from the base toward the slotted paper; a forming punch that sandwiches the slotted paper between the back punch and the punch and draws the slotted paper into a hollow portion of a die while folding it; and an insertion pusher that presses corners of the folded slotted paper while inserting it into the hollow portion, the insertion pusher having a first pressing portion that presses a first corner of the folded slotted paper and a second pressing portion that presses a second corner, and the protruding portion of the back punch abuts against the back portion between the first corner and the second corner of the folded slotted paper, and is formed with a width that is half or less of the length from the first corner to the second corner, which is the width of the back portion, in the same direction. This allows the insertion pusher to press the corners of the folded slotted paper. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a manufacturing device that can suppress the occurrence of buckling of slotted paper. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of a manufacturing apparatus according to a first embodiment. [Figure 2] 1A to 1C are diagrams showing a process of forming a slotted paper sheet according to the first embodiment. [Figure 3] 10 is a diagram showing an insertion pusher that contacts a slotted paper according to the first embodiment; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 Hereinafter, a stator manufacturing apparatus according to the present embodiment will be described with reference to the drawings. Fig. 1 is a diagram showing an example of a manufacturing apparatus 1 that forms and inserts slot paper 2 into slots in a stator core.

[0011] 2(a) to 2(d) are diagrams showing an example of the process of forming the slotted paper 2. Specifically, FIG. 2(a) shows the state before the slotted paper 2 is pulled in, FIG. 2(b) shows the state after the slotted paper 2 is pulled in, FIG. 2(c) shows the retraction of the forming punch 12 described below, and FIG. 2(d) shows the insertion of the insertion pusher 14 described below. Note that FIGS. 2(a) to 2(c) are top views, and FIG. 2(d) is a perspective view of the vicinity of the hollow portion 21.

[0012] The manufacturing apparatus 1 includes a female die 11, a forming punch 12, a back punch 13, and an insertion pusher 14. In the following description, the direction in which the slotted paper 2 is inserted into the die 11 using the forming punch 12 and back punch 13 is referred to as the X direction, and the direction in which the slotted paper 2 inserted into the die 11 is pushed by the insertion pusher 14 is referred to as the Z direction. Note that the X direction, Y direction, and Z direction are mutually perpendicular directions, and here the X direction and Y direction are referred to as horizontal directions, and the Z direction is referred to as the up-down direction or height direction, but this is not limited to this. Furthermore, in accordance with FIG. 2(a), the X direction may also be referred to as the left-right direction.

[0013] As shown in Figure 2(a), the die 11 is a female die having an internal hollow portion 21. The hollow portion 21 of the die 11 has projections and recesses facing in the Y direction so that when the flat slotted paper 2 is pressed by the forming punch 12 and inserted from the outside in the X direction with one side of the flat slotted paper 2 abutting against the forming punch 12 and the other side abutting against the back punch 13, the slotted paper 2 is deformed into a substantially U-shape.

[0014] In the die 11, at least a portion of the hollow portion 21 is open both above and below in the Z direction. Specifically, as will be described later, the lower end of the insertion pusher 14 is inserted from above the hollow portion 21 by descending from a position above the die 11. Thereafter, the lower end of the insertion pusher 14 can push the slotted paper 2 downward while reaching the lower end of the die 11.

[0015] Before the slotted paper 2 is inserted into the die 11, the forming punch 12 abuts against one side of the slotted paper 2 and presses it in the X direction toward the inside of the die 11. Also, as shown in FIG. 2(b), when the slotted paper 2 is placed in the hollow portion 21 of the die 11 and the slotted paper 2 becomes approximately U-shaped, the forming punch 12 abuts against the inside of the surface (back portion 2a) facing the opening side of the slotted paper 2. Here, the back portion 2a is placed on the tip side in the X direction within the die 11 and is flat and extends in the X and Z directions.

[0016] Before the slotted paper 2 is inserted into the die 11, the back punch 13 abuts against the surface opposite to the surface on which the slotted paper 2 abuts against the forming punch 12. In other words, the slotted paper 2 is sandwiched between the forming punch 12 and the back punch 13. Also, as shown in Figure 2(c), when the slotted paper 2 is placed in the hollow portion 21 of the die 11 and the slotted paper 2 becomes approximately U-shaped, the back punch 13 abuts against the outside of the back portion 2a of the slotted paper 2.

[0017] That is, the forming punch 12 and the back punch 13 can pull the flat slotted paper 2 sandwiched between them into the hollow portion 21 of the die 11 while folding the slotted paper 2 .

[0018] 3(a) to 3(c) are diagrams showing an example of the relationship between the slotted paper 2 formed into a roughly U-shape, the back punch 13, and the insertion pusher 14. More specifically, FIGS. 3(a) and 3(b) show an example of the shape of the portion where the insertion pusher 14 presses the end of the slotted paper 2 in the Z direction, and the portion to be pressed. Note that FIG. 3(a) is a bottom view, and FIG. 3(b) is a perspective view.

[0019] 3(c) is an enlarged bottom view of a portion of FIG. 3(a), showing the state in which, when the insertion pusher 14 presses the slotted paper 2, the protruding portion 32 of the back punch 13, which protrudes from the base 31 in the X direction, abuts against and supports the back portion 2a of the slotted paper 2. Here, the width of the protruding portion 32 in the Y direction is defined as width A.

[0020] The width in the Y direction of the back surface 2a of the slotted paper 2 formed into a substantially U-shape is defined as width B. The relationship between the width A of the protruding portion 32 of the back surface punch 13 and the width B of the back surface 2a of the slotted paper 2 is defined as follows:

number

[0021] The insertion pusher 14 comes into contact with the slotted paper 2 from the Z direction and is inserted into the die 11 while pressing the slotted paper 2 in the Z direction.

[0022] 3(a) and 3(b), the slotted paper 2 has two corners 2b and 2c on either side of the back surface 2a, and straight sections 2d and 2e that are approximately perpendicular to the back surface 2a. Here, the straight section on the side where corner 2b is provided is called straight section 2d, and the straight section on the side where corner 2c is provided is called straight section 2e.

[0023] 3(a) and 3(b), the insertion pusher 14 includes a first pressing portion 41 that presses corner portion 2b in the Z direction, a second pressing portion 42 that presses corner portion 2c in the Z direction, a third pressing portion 43 that presses straight portion 2d in the Z direction, and a fourth pressing portion 44 that presses straight portion 2e in the Z direction, for the slotted paper 2 that has been pulled into the die 11 by the shaping punch 12 and the back punch 13 and folded to form corner portion 2b and corner portion 2c. Note that the following description will be given assuming that these pressing portions 41 to 44 are provided at the lower end of the insertion pusher 14.

[0024] The first pressing portion 41 has a contact portion 41a that contacts the corner 2b, and a protrusion 41b that protrudes downward from the contact portion 41a to prevent the corner 2b from coming off the contact portion 41a. Typically, the protrusion 41b is L-shaped when viewed from below. This allows the protrusion 41b to guide the slotted paper 2 so that the position of the corner 2b does not shift outward and the slotted paper 2 contacts the contact portion 41a.

[0025] The second pressing portion 42 has a contact portion 42a that contacts the corner 2c and a protrusion 42b that protrudes downward from the contact portion 42a so as to prevent the corner 2c from coming off the contact portion 42a. Similar to the first pressing portion 41, the second pressing portion 42 is L-shaped when viewed from below.

[0026] The third pressing portion 43 presses downward a middle portion of the straight portion 2d in the X direction. Similarly, the fourth pressing portion 44 presses downward a middle portion of the straight portion 2e in the X direction.

[0027] The shape of the insertion pusher 14 as viewed from the Z direction is substantially the same as the shape of the hollow portion 21 provided in the die 11.

[0028] More specifically, the insertion pusher 14 moves downward to approach the die 11 from above. At this time, the insertion pusher 14 is inserted into the hollow portion 21, and can press the slotted paper 2, which has been drawn in and formed by the forming punch 12 and the back punch 13, downward in the Z direction from the hollow portion 21.

[0029] In addition, the insertion pusher 14 has the first pressing portion 41 and the second pressing portion 42 integrally formed, and the portion between the first pressing portion 41 and the second pressing portion 42 is formed thin in the X direction.

[0030] More specifically, the insertion pusher 14 has a recessed shape in the X direction between the first pressing portion 41 and the second pressing portion 42 so as not to interfere with the protrusion 32 of the back punch 13 that abuts against the back portion 2a of the slot paper 2.

[0031] Furthermore, the insertion pusher 14, the first pressing portion 41, the second pressing portion 42, the third pressing portion 43, and the fourth pressing portion 44 are integrated, and the area between the first pressing portion 41 and the third pressing portion 43 is recessed in the Y direction, so that this recessed area does not press on the slotted paper 2. The same is true for the area between the second pressing portion 42 and the fourth pressing portion 44.

[0032] Here, referring to Figures 2(a) to 2(d), an example of the procedure in the manufacturing apparatus 1, from drawing the slot paper 2 into the die 11 of the die 11 to forming it, to inserting the insertion pusher 14 into the hollow portion 21, will be described.

[0033] As shown in Figure 2(a), the back punch 13 is inserted into the hollow portion 21 of the die 11 of the manufacturing apparatus 1. Here, the back punch 13 is inserted from one end to the vicinity of the other end. In accordance with Figure 2(a), the back punch 13 will be described as being inserted from the right end to the vicinity of the left end.

[0034] The slotted paper 2 is disposed at the left end of the die 11. Here, the slotted paper 2 is in a flat state before being formed. Furthermore, the slotted paper 2 is sandwiched between the tip of the forming punch 12 disposed on the left side of the face and the tip of the back punch 13 disposed on the right side of the face.

[0035] In this state, the slotted paper 2 is cut to a predetermined size when folded at the hollow portion 21.

[0036] Next, as shown in Figure 2(b), the slotted paper 2 is drawn into the hollow portion 21 of the die 11. Specifically, the forming punch 12 moves to the right and enters the hollow portion 21, and the back punch 13 also moves to the right. At this time, the slotted paper 2 remains sandwiched between the forming punch 12 and the back punch 13, and is simultaneously drawn into the hollow portion 21.

[0037] At this time, the flat slot paper 2 is pulled into the hollow portion 21 in which a gap in a predetermined Y direction is formed, and is folded into a U-shape with a back portion 2a, corners 2b and 2c, straight portions 2d and 2e, etc.

[0038] 2(c) shows the state in which the slotted paper 2 is drawn into the hollow portion 21 and placed in a formed state, and the forming punch 12 is retracted. At this time, the back punch 13 remains in contact with the back portion 2a of the slotted paper 2.

[0039] As shown in FIG. 3(c), the tip of the back punch 13, which is formed to be narrow in the Y direction, is in contact with the back surface 2a of the slotted paper 2.

[0040] 2(d), the insertion pusher 14 disposed above the die 11 moves downward and is inserted into the hollow portion 21. At this time, the insertion pusher 14 presses downward four points of the slotted paper 2: the corners 2b and 2c and the straight portions 2d and 2e.

[0041] Here, the insertion pusher 14 presses the slotted paper 2 at four points, including the corners 2b and 2c. Therefore, the force transmitted from the insertion pusher 14 to the slotted paper 2 is less likely to deviate in the Y direction compared to when the force is transmitted at four points excluding the corners 2b and 2c.

[0042] To summarize the above, the forming punch 12 and the back punch 13 sandwich the slotted paper 2 and pull it into the die 11, thereby folding the slotted paper 2 and pulling it into the hollow portion 21 of the die 11. Furthermore, the insertion pusher 14, while being inserted into the hollow portion 21, can press the corners 2b, 2c and straight portions 2d, 2e of the slotted paper 2 that has been pulled into the hollow portion 21 of the die 11 and folded.

[0043] Therefore, when the insertion pusher 14 presses the slotted paper 2 downward to form it, the corners 2b and 2c are also pressed, so that the occurrence of buckling of the slotted paper 2 can be suppressed.

[0044] 3(c), the back punch 13 is formed so that the width of the protrusion 32 is short in the Y direction and abuts against the back portion 2a of the slotted paper 2. As a result, when the first pressing portion 41 and the second pressing portion 42 of the insertion pusher 14 press the corners 2b, 2c of the slotted paper 2 downward, the back punch 13 supports the back portion 2a of the slotted paper 2, and since the back punch 13 and the insertion pusher 14 do not overlap in position when viewed from the Z direction, they can avoid interfering with each other.

[0045] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the sake of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

[0046] For example, a former for adjusting the shape of the slotted paper 2 that is pushed by the insertion pusher 14 and sent out from the die 11 may be provided at the lower end of the die 11 .

[0047] For example, the third pressing portion 43 and the fourth pressing portion 44 can also be provided with protrusions that guide the straight portions 2d and 2e of the slot paper 2 so that they come into contact with the abutting portions, similar to the first pressing portion 41 and the second pressing portion 42. [Explanation of symbols]

[0048] 1 manufacturing device, 2 slotted paper, 2a rear portion, 2b first corner portion, 2c second corner portion, 2d straight portion, 2e straight portion, 11 die, 12 forming punch, 13 rear punch, 14 insertion pusher, 21 hollow portion, 31 base portion, 32 protruding portion, 41 first pressing portion, 41a contact portion, 41b protruding portion, 42 second pressing portion, 42a contact portion, 42b protruding portion, 43 third pressing portion, 44 fourth pressing portion

Claims

[Claim 1] a back punch having a base and a protrusion protruding from the base toward the slotted paper; a forming punch that sandwiches the slot paper between itself and the back punch and draws the slot paper into the hollow portion of the die while folding it; an insertion pusher that presses corners of the folded slot paper while inserting the folded slot paper into the hollow portion; The insertion pusher a first pressing portion that presses a first corner of the folded slotted paper, and a second pressing portion that presses a second corner of the folded slotted paper, The protruding portion of the back punch is abutting against the back surface of the folded slotted paper between the first corner and the second corner, and formed in the same direction with a width equal to or less than half the length from the first corner to the second corner; Manufacturing equipment.

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